Electric chain saw



FIG. 1 is a front and left-side perspective view of a electric chain saw showing my new design; The broken line showing is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a front elevational view;

FIG. 3 is a right-side elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a right side elevational view;

FIG. 6 is a top plan view; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an electric chain saw, as shown and described. 